This dissertation presents a clear and systematic method for conducting cumulative effects assessments in the United States in a manner consistent with the 1997 guidelines of the President's Council on Environmental Quality and the 1999 guidance of the U.S. Environmental Protection Agency's Office of Federal Activities. This method has been developed in a collaborative process with federal and State of Alaska regulatory agency personnel and private sector practitioners, including a workshop convened by the author for this purpose, and it has received wide public and regulatory scrutiny during the renewal of the federal and state right-of-way leases for the Trans Alaska Pipeline System in 2004 and in the June 2004 Alaska Groundfish [...]